Hacker News Reader

> Does anyone have a tool for that? It would be similar to how QEMU/KVM does it for VM migrations. (They only support doing it for RAM though.)

I don't know of anything wrapping it, but if I was doing that I'd just put it on ZFS (handing zvols to qemu as disks) and then do incremental snapshots and send-recv them. (Bonus: trivial inline compression, and if you `zfs send --raw` even the transfer will be compressed)

View on HN

Ah. Yeah, that's what I have been doing. It took about an hour to send 100G initial ZFS seed over the network between different datacenters. Then I suspended all of the VMs and sent the remaining incremental.

The --raw/-w flag does send the compressed data.

It always feels brittle to me because of how manual the process is. Maybe it's time to create some decent scripts with safe logic and checks...

Scripting would be nice, but unless you're deleting things it feels extremely safe to me, since you're working on (and retain) snapshots the whole way; if anything ever does go wrong just roll back:)

Reply on news.ycombinator.com